CN2175238Y

CN2175238Y - Positive plate of electroplating bath made of zinc-nickel alloy

Info

Publication number: CN2175238Y
Application number: CN 93240601
Authority: CN
Inventors: 吴继勋; 刘永勤; 卢燕平; 孟慧民
Original assignee: University of Science and Technology Beijing USTB
Current assignee: University of Science and Technology Beijing USTB
Priority date: 1993-09-29
Filing date: 1993-09-29
Publication date: 1994-08-24
Anticipated expiration: 2003-09-29

Abstract

The utility model relates to a plating anode, particularly a zinc nickel alloy plating anode. The plating anode adopts a separate zinc, a nickel anode and a microporous barrier anode casing to form distributary control and to realize the proportionally stable solubilization of zinc and nickel, and a zinc plate and the nickel ion in the plating solution are effectively separated to prevent the displacement reaction of the nickel ion to the zinc and keep a certain groove pressure so that the plating quality of the zinc nickel alloy is improved.

Description

Positive plate of electroplating bath made of zinc-nickel alloy

The utility model relates to electroplating uses anode, particularly Zn-Ni alloy electroplating anode.

Keeping in the plating bath concentration of metal ions stable is important techniques very in the electroplating technology, directly affects electroplating quality.In ammonium chloride system, Zn-Ni alloy electroplating is difficult to use insoluble anode.In the prior art, what Zn-Ni alloy electroplating was selected for use is that solubility Zn or Ni do anode separately and since the redox potential of Ni than the positive 0.5V of Zn about, Ni very easily takes place ²⁺To the replacement(metathesis)reaction of Zn,, can not stop Ni even adopt the individual layer woven dacron to isolate ²⁺To the violent displacement of Zn, thereby cause Zn ²⁺, Ni ²⁺Ionic concn breaks away from the scope of technology controlling and process, and adopts multilayer woven dacron sealing coat to cause groove voltage rise height, anode heating, Zn ²⁺Can not in time spread the inner white depositions that produces.

The purpose of this utility model is to overcome above-mentioned anodic deficiency, adopts the discrete anode, adds the microporous membrane anode jacket, and has resistance and Zn plate to join, and forms flow-dividing control by regulating resistance, realizes the stable in proportion dissolving of discrete Zn, Ni anode.Reach simultaneously the Ni in Zn pole plate and the plating bath ²⁺The purpose that the groove that still do not raise after keeping apart is pressed.

The utility model is made up of two soluble anodes of Zn, Ni (1), (2) and microporous membrane anode jacket (3), resistance (4), and Zn, Ni anode are parallel discrete, are covered with the microporous membrane anode jacket on the Zn pole plate, and join with an adjustable resistance.Be covered with diameter 10 above the microporous membrane anode jacket

～1000

Micropore.

Fig. 1 is the utility model anode interface chart.

By shown in Figure 1, with Zn, the Ni anode is parallel discretely is placed in the coating bath that fills the ammonium chloride plating bath, be covered with the microporous membrane anode jacket on the Zn pole plate, and connect an adjustable resistance.During plating, by regulating the resistance of a branch road, discrete anode forms flow-dividing control, makes Zn in the plating bath ²⁺And Ni ²+ the content kept stable, having remedied independent use Zn anode can't satisfy Ni ²⁺Automatically additional deficiency.The microporous membrane anode jacket stops the Ni in the plating bath ²⁺Be penetrated in the anolyte, thereby prevented Ni effectively ²⁺With Zn plate generation replacement(metathesis)reaction.

Further specify characteristics of the present utility model below in conjunction with embodiment:

At ZnCl ₂70g/l, NiCl ₂6H ₂O130g/l, NH ₄Parallel placement anode described in the utility model in the plating bath of C1220g/l, PH4.5, Zn plate 200 * 100 * 10mm, Ni plate 50 * 35 * 10mm, area are covered with diameter 100 than about 9:1 on the Zn plate

The anode jacket of micropore, and connect an adjustable resistance, R=0.0125 Ω feeds current i _D=2A/dm ²

Fig. 2 is energising amount Q(AH) with plating bath in Ni ²⁺The relation curve of concentration (g/l).As shown in Figure 2, Ni ²⁺Concentration is little with the variation of energising amount, illustrates that the microporous membrane anode jacket has reached basically with the Ni in the plating bath ²⁺The effect of coming with the Zn electrode isolation.

Table 1 woven dacron and microporous membrane isolation method bath voltage synopsis (1=3A)

The anode mode	Naked Zn plate	3 layers of woven dacron wrapping	Microporous membrane is isolated
				Bath voltage (V)	0.95	3.00	1.00

As shown in Table 1, after microporous membrane was isolated, the variation that groove is pressed was isolated much smaller more than woven dacron, essentially no variation.Press because microporous membrane is isolated the groove can keep certain, played the effect of economize on electricity, not reason anode heat release and heat up too fastly of bath temperature simultaneously can reach bath temperature and keep the constant purpose.

Claims

1, a kind of zinc, nickelalloy are electroplated and are used anode, comprise pole plate, it is characterized in that Zi, the discrete parallel placement of Ni plate are covered with the microporous membrane anode jacket, and join with an adjustable resistance on the Zn pole plate.

2, anode as claimed in claim 1 is characterized in that, is covered with diameter 10 on the microporous membrane anode jacket ～1000

Micropore.